<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .container
        {
            display: flex;
            flex-wrap: wrap;
            flex-shrink: 0;
            justify-content: flex-start;
            width: 350px;
        }

        .item
        {
            width: 30%;
            height: 100px;
            margin: 5px;
            background-color: red;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
    </div>
</body>
</html>